Radiology billing
Most of what a radiology practice bills follows rules it shares with every other specialty that reads a diagnostic test. The exception is mammography, and it is not a small one: Medicare has carved mammography out of its imaging rules four separate times, in four separate instruments, and conditions payment for it on a certificate no other imaging service needs.
- Coverage depends on an FDA certificate under the Public Health Service Act, not on a CMS enrollment standard
- A physician who is not treating the patient may order a diagnostic mammogram -- the only such exception in the diagnostic-testing rule
- Mammography is excluded by statute from the hospital outpatient payment system every other modality flips to
- It is also excluded from the statutory cap that limits imaging technical components to the outpatient rate
This is an educational guide to how billing works for radiology — its workflow, coding, and payer considerations. It is general information, not a statement that US Medical Billing serves this specialty, and not billing, coding, or legal advice.
What makes radiology billing distinct
The professional and technical components, prior authorization for advanced imaging, and the ordering physician's documented indication are real features of a radiology revenue cycle, but they are not what separates it from cardiology, sleep medicine or neurodiagnostics -- all of which split components, all of which are ordered by someone else, and all of which sit under the same diagnostic-testing regulation. What separates radiology is one modality that Medicare treats as a distinct legal object.
42 CFR 410.34 is titled "Mammography services: Conditions for and limitations on coverage," and it exists because Congress put mammography quality under the Food and Drug Administration rather than under CMS. Paragraph (c) makes Part B payment for a screening mammogram conditional on the facility meeting the certification requirements of section 354 of the Public Health Service Act, as implemented by 21 CFR part 900, subpart B; paragraph (b)(2) does the same for diagnostic mammography. The statutory twin at 42 U.S.C. 1395m(c)(1)(B) says payment may be made only if the study is conducted by a facility holding a certificate or provisional certificate. Nothing else a radiology practice bills has its coverage decided by a certificate from a different agency.
The carve-outs then repeat across unrelated instruments. 42 CFR 410.32(a)(1) lets a physician who does not treat the patient order a diagnostic mammogram off a screening finding, which is the only exception to the treating-physician rule anywhere in that section. 42 CFR 410.33(a)(2)(i) excuses diagnostic mammography from most of the independent diagnostic testing facility standards, expressly because the FDA regulates it. 42 U.S.C. 1395l(t)(1)(B)(iv) writes screening and diagnostic mammography out of the definition of a covered hospital outpatient service. And 42 U.S.C. 1395w-4(b)(4)(B) lists the imaging services subject to the technical-component cap -- X-ray, ultrasound, nuclear medicine, magnetic resonance, computed tomography, fluoroscopy -- and then excludes mammography from the list. Four exclusions, four different bodies of law, one modality.
How radiology billing flows
The sequence below is the ordinary diagnostic-testing path, annotated at the four points where a mammogram leaves it. Those are the points where a radiology claim behaves unlike any other imaging claim.
The order, and who is allowed to write it
42 CFR 410.32(a) requires a diagnostic test to be ordered by the physician who is treating the beneficiary and who uses the result in managing that specific problem. The mammography exception at (a)(1) is the single departure: a physician who meets the interpreting-physician qualifications under section 354 of the Public Health Service Act, as provided in 410.34(a)(7), may order a diagnostic mammogram based on the findings of a screening mammogram even though that physician does not treat the beneficiary. Note the narrowing in the other direction as well -- 410.34(b)(1) requires diagnostic mammography to be ordered by a doctor of medicine or osteopathy, where 410.32 otherwise permits nonphysician practitioners to order tests.
Common operational challenges
Radiology's characteristic problems are not volume problems. They are problems of a service whose conditions of payment are held in instruments the billing office does not normally read.
A condition of payment held by another agency
FDA certification is administered under the Public Health Service Act and 21 CFR part 900, not under any CMS enrollment process. A lapse, or a cease notification, is not visible in the systems a practice watches for Medicare enrollment problems, and it stops payment for the service regardless.
One physician's status can reach the facility
Under 410.34(a)(7)(iii) a supplier must not employ, for provision of the professional component, a physician about whom it has received written FDA notification of a certification violation. That makes an individual interpreting physician's FDA standing a facility-level exposure on the professional component, not merely a personal one.
An interval counted in months, not years
Scheduling a screening study on its annual anniversary will eventually produce a claim submitted before the regulation's interval has elapsed, because the count runs from the month in which the previous screening was performed and is shorter than a year. It is a scheduling defect that surfaces as a coverage denial.
Rules that look general but are not
The independent diagnostic testing facility standards, the treating-physician ordering rule and the imaging technical-component cap all read as though they apply to imaging as a class. Each has a mammography exception written into it, and applying the general rule to a mammogram gets the wrong answer in a different direction each time.
Documentation and coding considerations
Documentation for a mammogram has to satisfy conditions written in three places at once: the coverage regulation, the diagnostic-testing regulation, and the FDA certification the coverage regulation points to. The notes below describe those requirements rather than reproduce any code descriptions, which are the American Medical Association's.
The order carries an exception and a narrowing
Under 410.32(a)(1) a non-treating physician who meets the 410.34(a)(7) interpreting-physician qualifications may order a diagnostic mammogram off a screening finding. Under 410.34(b)(1) that order must nonetheless come from a doctor of medicine or osteopathy. Both facts are specific to this modality and neither generalizes to other imaging.
Views are a coverage condition, not a technique note
410.34(d)(1) requires a screening study to be, at a minimum, a two-view exposure -- cranio-caudal and medial lateral oblique -- of each breast. The record has to show the views because the regulation states them as a limitation on coverage.
Which definition the patient falls under
Diagnostic mammography is defined at 410.34(a)(1) for a man or a woman with signs, symptoms, or a qualifying personal history; screening mammography at (a)(2) only for a woman without signs or symptoms. The documented indication is what selects between two definitions with different conditions attached.
Component modifiers, shared with the rest of imaging
The split between the interpretation and the equipment is reported with modifier 26 or TC, or billed globally where one entity furnishes both. This part of radiology coding is not distinctive -- the fee schedule, not the modifier, decides whether a code splits at all, and the linked article covers it in full.
Denial and rejection risks
The mammography-specific denials below are preventable at the front end. The rest of a radiology denial profile looks like any other diagnostic-testing specialty's.
Certificate lapsed, suspended, or never in evidence
Payment under 410.34(b)(2) and (c) is conditioned on the supplier meeting the section 354 certification requirements. A study furnished while the facility lacked a valid certificate, or while under an FDA cease notification, has no route back through appeal because the condition of payment was not met at the time of service.
Screening submitted before the interval has run
The interval in 410.34(d)(4) is counted in whole months following the month of the prior screening. A claim submitted on the calendar anniversary can fall inside it, and the denial is a frequency determination rather than a medical-necessity one.
An order the regulation does not authorize
A diagnostic mammogram ordered by a nonphysician practitioner does not meet 410.34(b)(1), even though 410.32 permits nonphysician practitioners to order diagnostic tests generally. Conversely, refusing an order from a qualified interpreting physician who is not the treating physician discards a study the regulation expressly allows.
Expected reimbursement modeled on the wrong payment system
Because 42 U.S.C. 1395l(t)(1)(B)(iv) excludes mammography from covered hospital outpatient services, and 1395w-4(b)(4)(B) excludes it from the imaging technical-component cap, a variance model that treats it like other hospital outpatient imaging will flag correct payments as underpayments and miss real ones.
Payer-process considerations
Two of the four mammography carve-outs are payment mechanics rather than coverage rules, which means they change what the practice should expect to be paid rather than whether the claim is payable at all.
The imaging technical-component cap, and what it leaves out
42 U.S.C. 1395w-4(b)(4)(A) provides that where the fee schedule technical component of an imaging service exceeds the hospital outpatient amount, the outpatient amount is substituted. Subparagraph (B) lists the services this reaches -- X-ray, ultrasound including echocardiography, nuclear medicine including positron emission tomography, magnetic resonance, computed tomography and fluoroscopy -- and excludes diagnostic and screening mammography from that list.
A hospital outpatient mammogram is not an outpatient service
The definition of covered hospital outpatient department services at 42 U.S.C. 1395l(t)(1)(B)(iv) expressly does not include screening mammography, diagnostic mammography, or personalized prevention plan services. Every other imaging modality furnished in that setting moves onto the outpatient prospective payment system; this one does not.
Who counts as a radiologist is defined by statute
For the purposes of the radiologist-services payment subsection, 42 U.S.C. 1395m(b)(6) provides that the term covers only radiology services performed by, or under the direction or supervision of, a physician certified or eligible to be certified by the American Board of Radiology, or a physician for whom radiology services account for at least the share of total Part B charges the statute fixes. Federal drafting rarely names a specialty board; here it does.
Commercial policy sits on top, not underneath
Commercial plans apply their own medical policy and their own utilization review to imaging, including advanced-imaging authorization routed through a benefit manager. Those are contract terms; the mammography rules above are conditions of the Medicare benefit and are not negotiable in the same way.
Revenue-cycle checkpoints
Four of the six checks below exist only because of mammography. That is the honest measure of how much of this specialty's exposure sits in one modality.
- Hold current evidence of the facility's FDA certificate or provisional certificate, and know who is responsible for noticing when it is due.
- Confirm no interpreting physician furnishing the professional component is the subject of an FDA violation notification the facility has received.
- Count the screening interval in whole months from the month of the previous screening, not from its calendar anniversary.
- Check that a diagnostic mammogram was ordered by a doctor of medicine or osteopathy, and accept an order from a qualified interpreting physician who is not the treating physician.
- Model expected payment for mammography outside the hospital outpatient payment system and outside the imaging technical-component cap.
- For everything other than mammography, confirm the component reported matches equipment ownership and the interpreting relationship, and screen the claim against the usual edits.
Related & connected
Services, tools, background reading and definitions that connect to the radiology revenue-cycle steps above.
Related services
- Eligibility verificationFront-end coverage and prior-authorization checks that prevent advanced-imaging denials.
- Coding supportComponent modifiers, contrast and view detail, and the documentation the mammography conditions of coverage require.
- Denial managementWorking authorization, medical-necessity and frequency denials to resolution.
Calculators & tools
From the Knowledge Base
- Modifier 26 and TC: billing one service in two halvesThe component split in full -- why the fee schedule, not the modifier, decides whether a code splits at all.
- Medicare preventive services billingHow a screening benefit is structured, which is what a screening mammogram is billed as.
- Medical necessity denialsWhy a frequency limit written into a regulation is a different denial from a coverage-policy one.
- National and local coverage determinationsThe coverage instruments that govern the imaging this page does not carve out.
- Medicare enrollment and billing privilegesThe enrollment route a testing facility takes -- and the certificate above is separate from all of it.
- Enrollment maintenance: the records that lapseThe discipline an FDA certificate needs, applied to the credentials a practice already tracks.
- Place of service on professional claimsThe field a component split changes, and the one a mobile testing arrangement decides by where the test was performed.
- The Stark Law and physician self-referralRadiology and imaging are named designated health services, so who referred the study is a compliance question as well as a coverage one.
Glossary
- Medical necessityThe standard an imaging study meets through an order the radiology practice did not write.
- ModifierThe two-character code that here says which half of a split service was furnished.
- Place of serviceThe field a component split changes, and one the testing-facility rules above turn on.
- Prior authorizationThe gate most advanced imaging passes through before the study is acquired.
- Fee scheduleThe amount the imaging technical-component cap measures against the outpatient rate.
Related specialties
- Cardiology billingThe other specialty that splits components across a whole diagnostic catalog -- and whose monitoring entities are classified as independent diagnostic testing facilities too.
- Sleep medicine billingAnother diagnostic-testing specialty under the same ordering and supervision rules, which is why those rules are not what makes radiology distinct.
Frequently asked questions
Why does a mammogram need an FDA certificate when no other imaging study does?
Because Congress placed mammography quality under the Food and Drug Administration rather than under CMS, and Medicare then made that certification a condition of payment. 42 CFR 410.34(c) pays for screening mammography only where the supplier meets the certification requirements of section 354 of the Public Health Service Act, as implemented by 21 CFR part 900, subpart B, and 410.34(b)(2) applies the same condition to diagnostic mammography. The statute agrees at 42 U.S.C. 1395m(c)(1)(B).
Can a physician who is not treating the patient order a diagnostic mammogram?
Yes, and this is the only place in the diagnostic-testing regulation where that is true. 42 CFR 410.32(a)(1) provides that a physician who meets the interpreting-physician qualification requirements under section 354 of the Public Health Service Act, as provided in 410.34(a)(7), may order a diagnostic mammogram based on the findings of a screening mammogram even though the physician does not treat the beneficiary. Separately, 410.34(b)(1) requires the order to come from a doctor of medicine or osteopathy.
Why does a hospital outpatient mammogram not pay like other hospital outpatient imaging?
Because it is not a covered hospital outpatient department service. 42 U.S.C. 1395l(t)(1)(B)(iv) excludes screening mammography, diagnostic mammography and personalized prevention plan services from the definition, so a mammogram does not move onto the outpatient prospective payment system in the way computed tomography, magnetic resonance and nuclear studies do. The same modality is also excluded from the imaging technical-component cap at 42 U.S.C. 1395w-4(b)(4)(B).
Is an independent diagnostic testing facility a radiology concept?
No, and treating it as one is a common error. 42 CFR 410.33 reaches diagnostic procedures payable under the physician fee schedule generally, which is why its own exception list has to name audiologists, clinical psychologists and certain physical therapists. Cardiac and neurological monitoring entities are classified as independent diagnostic testing facilities too. The one genuinely radiology-specific line in the section is 410.33(a)(2)(i), which excuses diagnostic mammography from most of its criteria because the FDA regulates it.
How often will Medicare pay for a screening mammogram?
The limit is expressed as a number of whole months that must pass following the month in which the last screening mammography was performed, together with an age floor and a single-study allowance in the band just above it. It is not one study per calendar year, and the interval is shorter than twelve months, which is why scheduling on the annual anniversary produces frequency denials. The figures are in 42 CFR 410.34(d)(2) through (d)(4) and 42 U.S.C. 1395m(c)(2)(A), and 1395m(c)(2)(B) lets the Secretary revise them.
Sources
Last reviewed August 2, 2026.
- Office of the Federal Register / eCFR42 CFR 410.34 -- Mammography services: Conditions for and limitations on coverage. (a)(1) defining diagnostic mammography for a man or woman with signs or symptoms, a personal history of breast cancer, or biopsy-proven benign breast disease, and (a)(2) defining screening mammography only for a woman without signs or symptoms; (a)(7)(i)-(iii) requiring a valid FDA certificate or provisional certificate, the absence of an FDA notification to cease conducting mammography examinations, and that the facility not employ for the professional component a physician it has been notified is in violation; (b)(1) requiring a diagnostic mammogram to be ordered by a doctor of medicine or osteopathy as defined in section 1861(r)(1) of the Act; (b)(2) and (c) conditioning payment on certification under section 354 of the Public Health Service Act as implemented by 21 CFR part 900, subpart B; (d)(1) requiring at minimum a two-view exposure, cranio-caudal and medial lateral oblique, of each breast, and (d)(2)-(d)(4) the age and interval limitations. Read in the eCFR text current through 30 July 2026
- Office of the Federal Register / eCFR42 CFR 410.32 -- diagnostic x-ray tests, diagnostic laboratory tests, and other diagnostic tests. (a) requiring the test to be ordered by the physician who is treating the beneficiary and using the result in managing that specific problem; (a)(1) the mammography exception, permitting a physician who meets the interpreting-physician qualifications under section 354 of the Public Health Service Act as provided in 410.34(a)(7) to order a diagnostic mammogram based on the findings of a screening mammogram even though the physician does not treat the beneficiary; (b)(3) the general, direct and personal supervision definitions; (b)(4) permitting a test performed by a registered radiologist assistant certified and registered by the American Registry of Radiologic Technologists, or a radiology practitioner assistant certified by the Certification Board for Radiology Practitioner Assistants, that would otherwise require personal supervision to be furnished under direct supervision to the extent State law and scope of practice permit
- Office of the Federal Register / eCFR42 CFR 410.33 -- independent diagnostic testing facility. (a)(1) applying to diagnostic procedures payable under the physician fee schedule and describing an IDTF as a fixed location, a mobile entity or an individual nonphysician practitioner; (a)(2) excusing four categories of diagnostic test, the first being diagnostic mammography procedures "which are regulated by the Food and Drug Administration", from the criteria in paragraphs (b) through (e) and (g) and (h) -- and only those paragraphs; (b)(1) limiting a supervising physician to general supervision of no more than three sites; (d) requiring a written order from the treating physician specifying the diagnosis and barring the facility from adding procedures on internal protocol; (e)(2), under the heading "Multi-State entities", setting the place of service by where the test was performed; (g) the seventeen standards the facility certifies in its enrollment application, including (g)(7) barring direct solicitation of patients and (g)(15) barring a fixed-base facility from sharing a practice location or the equipment used in the initial test; (h) providing that failure to meet a standard denies enrollment or revokes billing privileges
- Legal Information Institute, Cornell Law School (United States Code)42 U.S.C. 1395l(t)(1)(B)(iv) (Social Security Act section 1833(t)) -- the definition of covered OPD services "does not include screening mammography (as defined in section 1395x(jj) of this title), diagnostic mammography, or personalized prevention plan services", so mammography does not move onto the hospital outpatient prospective payment system
- Legal Information Institute, Cornell Law School (United States Code)42 U.S.C. 1395w-4 (Social Security Act section 1848) -- (b)(4)(A) substituting the hospital outpatient amount where the fee schedule technical component of an imaging service exceeds it, and (b)(4)(B) listing the imaging services reached, "including X-ray, ultrasound (including echocardiography), nuclear medicine (including positron emission tomography), magnetic resonance imaging, computed tomography, and fluoroscopy, but excluding diagnostic and screening mammography"
- Legal Information Institute, Cornell Law School (United States Code)42 U.S.C. 1395m (Social Security Act section 1834) -- (b)(6) defining "radiologist services", for the purposes of that subsection and section 1395l(a)(1)(J), as including only radiology services performed by or under the direction or supervision of a physician certified or eligible to be certified by the American Board of Radiology, or for whom radiology services account for at least the stated share of total Part B charges; (c)(1) permitting payment for screening mammography only where the frequency is consistent with paragraph (2) and the study is conducted by a facility holding a certificate or provisional certificate; (c)(2)(A) the age and interval limits and (c)(2)(B) reserving revision of the frequency to the Secretary
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